Church Avenue is a fully ADA accessible stop on the two track IRT Nostrand Avenue Subway, the station has two side platforms, with no crossover, so no free change of direction transfer. The station was rehabilitated in 1997, as a plaque in the station commemorates. Each platform was retiled in a replica way of its original 1920 Dual-Contracts era tiling with Church Ave name tablets on a blue background with a green boarder. The station's trim line is similar: a light yellowish-brown for the main solid sections with a boarder composed of a majority of green tiles. There are Cs in it for Church at regular intervals. Beneath the original 1920s trimline more modern day streaks of color have been added along the platform walls. For about the first two feet of the platform walls the tiles are a green color, there is a single tile line of a yellow above this that forms accent lines up to the Cs in the station's trimline.
The platforms are quite narrow towards the ends of each and become wider towards the middle as the stations exits are directly on each platform (no free-crossover or under) in the middle of each platform. Each platform's exit has at least one staircase (some corners have two) out to both sides of Church Avenue. There is also two elevators down from the street to, one to each platform level fare control area. The Manhattan-bound platform has the station's only turnstiles and token booth. Fare control for the Flatbush-bound platform is fully automated with three High Exit Turnstiles for passengers leaving the subway system and a single High Entrance/Exit Turnstile for passengers trying to get on Flatbush-bound trains.